← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 161 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.51² =
  2. 2.69² =
  3. 3.71² =
  4. 4.91² =
  5. 5.91² =
  6. 6.49² =
  7. 7.91² =
  8. 8.31² =
  9. 9.19² =
  10. 10.69² =
  11. 11.41² =
  12. 12.31² =
  13. 13.21² =
  14. 14.19² =
  15. 15.19² =
  16. 16.51² =
  17. 17.41² =
  18. 18.61² =
  19. 19.41² =
  20. 20.79² =
  21. 21.31² =
  22. 22.61² =
  23. 23.41² =
  24. 24.19² =
  25. 25.29² =
  26. 26.21² =
  27. 27.81² =
  28. 28.71² =
  29. 29.89² =
  30. 30.79² =
  31. 31.71² =
  32. 32.89² =
  33. 33.39² =
  34. 34.49² =
  35. 35.49² =
  36. 36.51² =
  37. 37.71² =
  38. 38.61² =
  39. 39.51² =
  40. 40.21² =

Answer key

  1. 2601
  2. 4761
  3. 5041
  4. 8281
  5. 8281
  6. 2401
  7. 8281
  8. 961
  9. 361
  10. 4761
  11. 1681
  12. 961
  13. 441
  14. 361
  15. 361
  16. 2601
  17. 1681
  18. 3721
  19. 1681
  20. 6241
  21. 961
  22. 3721
  23. 1681
  24. 361
  25. 841
  26. 441
  27. 6561
  28. 5041
  29. 7921
  30. 6241
  31. 5041
  32. 7921
  33. 1521
  34. 2401
  35. 2401
  36. 2601
  37. 5041
  38. 3721
  39. 2601
  40. 441

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths